code: def build_op():
      """Return function to build nested operator."""
  
      return qml.adjoint(
          qml.prod(
              qml.RX(1, 0) ** 1,
              qml.RY(1, 0),
              qml.prod(qml.adjoint(qml.PauliX(0)), qml.RZ(1, 0)),
              qml.RX(1, 0),
          )
      )
  
file_path: pennylane/tests/ops/functions/test_simplify.py
imports: import pytest
  import pennylane
  from pennylane import numpy
  from pennylane.tape import QuantumScript
label_desc: Use image node_id 1 for calling a global function with example usage: build_op() and returns: qml